Rear bumper



FIG. 1 is a front and right side perspective view of a rear bumper showing my new design;

FIG. 2 is a rear and left side perspective view thereof;

FIG. 3 is a front view thereof.

FIG. 4 is a rear view thereof.

FIG. 5 is a left side view thereof.

FIG. 6 is a right side view thereof.

FIG. 7 is a top view thereof; and,

FIG. 8 is another front and right side perspective view of the rear bumper shown in FIG. 1, with the rear bumper mounted on a vehicle shown in de-emphasized and half-tone portions so as to illustrate environmental structures for the vehicle rear. These portions form no part of the claimed invention. More particularly, in FIG. 8, the rear bumper of the present invention is shown within the broken line, and any elements shown outside of the broken line form no part of the claimed invention, but are instead included to show environmental aspects of the claimed invention. 

CLAIM The ornamental design for a rear bumper, as shown and described. 